srm.exe安装外壳扩展:失败，并显示“无法转换基础导出值”

Question

我用SharpShell编写了这个简单的外壳扩展(浏览器上下文菜单)：

[ComVisible(true)]
[COMServerAssociation(AssociationType.AllFiles)]
public class SampleExtension : SharpContextMenu
{
    protected override bool CanShowMenu()
    {
        return true;
    }
    protected override ContextMenuStrip CreateMenu()
    {
        var menu = new ContextMenuStrip();
        var item = new ToolStripMenuItem
        {
            Text = "Hello world!"
        };
        menu.Items.Add(item);
        return menu;
    }
}

它可以与SharpShell服务器管理器一起调试，但当我尝试通过srm.exe在命令行上安装它时，我得到：

srm.exe install ..\SampleExtension\bin\Debug\CountLinesExtension.dll -codebase  

System.ComponentModel.Composition.CompositionContractMismatchException was unhandled
  HResult=-2146233088
  Message=Cannot cast the underlying exported value of type 'SharpShell.SharpShellServer (ContractName="SharpShell.ISharpShellServer")' to type 'SharpShell.ISharpShellServer'.
  Source=System.ComponentModel.Composition
  StackTrace:
       at System.ComponentModel.Composition.ExportServices.CastExportedValue[T](ICompositionElement element, Object exportedValue)
       at System.ComponentModel.Composition.ExportServices.GetCastedExportedValue[T](Export export)
       at System.ComponentModel.Composition.ExportServices.<>c__DisplayClassa`1.<CreateStronglyTypedLazyOfT>b__7()
       at System.Lazy`1.CreateValue()
       at System.Lazy`1.LazyInitValue()
       at System.Lazy`1.get_Value()
       at ServerRegistrationManager.Application.<LoadServerTypes>b__2(Lazy`1 st)
       at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
       at ServerRegistrationManager.Application.InstallServer(String path, RegistrationType registrationType, Boolean codeBase)
       at ServerRegistrationManager.Application.Run(String[] args)
       at ServerRegistrationManager.Program.Main(String[] args)

如何解决这个问题？

Answer 1

我们遇到了同样的问题。事实证明，我们只是没有从与我们的dll相同的目录运行srm.exe。我们的dll包含了其他dll，所以它不能以这种方式加载。一旦我们将所有dll放在同一个目录下运行srm.exe，它就可以工作了。